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The maximum K.E of photoelectrons emitted from a metallic surface is 30 eV when monochromatic radiation of wavelength falls on it .When the same surface is illuminated with light of wavelength 2 , the maximum K.E of photoelectrons is observed to be 10 eV . Calculate the wavelength and determine the maximum wavelength of incident radiation for which photoelectrons can be emitted by this surface . (h=6.62 X 10-34 ,J-s =4.14 x 10-15 eV-s , c= 3 X 108 m/s )( ans-> 310.5 Amstrong , 1242 Amstrong )
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